Private Notes Post Type Snippet

On this website and several others, I use a hidden post type called note(s) to store private notes usually linked directly to blog posts or tutorials, as well as modifications I make to plugins and site setups.

I achieve this by making the custom post type and then making that note type private using the following snippet.

function set_default_status_for_new_note_posts($post_id, $post, $update) {
    // Check if the saved post is of the 'note' post type and it's a new post (not an update)
    if ('note' === $post->post_type && !$update) {
        // Update the post status to 'private'
        wp_update_post(array('ID' => $post_id, 'post_status' => 'private'));
    }
}

add_action('save_post', 'set_default_status_for_new_note_posts', 10, 3);

The reason I’ve done it this way rather than use a notes plugin is because its reasonably secure and in addition WordPress native so other than my snippet above its all native and easy to extract, export and backup.